Limbs elevated against gravity but not against force is which power
**Core Concept**
The question is testing the concept of muscle power, specifically the ability to lift limbs against gravity versus against external resistance. Muscle power is a measure of the rate of doing work, and it is essential to differentiate between the power required to lift a limb against gravity and the power required to lift a limb against external resistance.
**Why the Correct Answer is Right**
The correct answer is related to the concept of **isometric muscle contraction**. During isometric muscle contraction, the muscle generates force without moving the joint or moving the limb against gravity. However, if the limb is subjected to external resistance, the muscle must generate additional force to overcome the resistance, which requires **isotonic muscle contraction**. The power required to lift a limb against gravity is less than the power required to lift a limb against external resistance.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the type of muscle contraction. Isotonic muscle contraction is the correct answer when considering the power required to lift a limb against external resistance.
* **Option B:** This option is incorrect because it is a type of muscle contraction that is not relevant to the question.
**Clinical Pearl / High-Yield Fact**
Remember that muscle power is an essential component of muscle function, and it is crucial to differentiate between isometric and isotonic muscle contractions when assessing muscle function.
**Correct Answer: C. Isometric muscle contraction**